Scientists do not debate whether evolution (descent with modification) took place, but they do argue about how it took place. Details of the processes and mechanisms are vigorously debated. Antievolutionists may hear the debates about how evolution occurs and misinterpret them as debates about whether evolution occurs. Evolution is sound science and is treated accordingly by scientists and scholars worldwide.
http://evolution.berkeley.edu/evolibrary/misconceptions_faq.php#b2
Certain assumptions are sacrosanct, yes.